The Piston,linear Actuating Cylinder, cataloged under National Stock Number 3040-01-500-9029, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-500-9029 |
| Primary Part Number | 556-6985454-6A |
| Item Name | Piston,linear Actuating Cylinder |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 13.467 INCHES MINIMUM AND 13.470 INCHES MAXIMUM IN |
| Ring Groove Quantity | 2 |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 556-6985454-6A PRIMARY | Naval Sea Systems Command (USA) |
| 556-6985454-6B | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| H642-6930-6A | 5/2 Secondary reference U.S. Government activity |
| H642-6930-6B | 5/2 Secondary reference U.S. Government activity |
| 556-6985454 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-500-9029 is a Piston,linear Actuating Cylinder, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-500-9029 has 2 manufacturer part numbers on file: 556-6985454-6A (Naval Sea Systems Command), 556-6985454-6B (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-672-4409. Verify interchangeability with system specifications before substitution.
Key specifications for 556-6985454-6A: Outside Diameter: 13.467 INCHES MINIMUM AND 13.470 INCHES MAXIMUM IN; Overall Length: 4.060 INCHES NOMINAL IN; Ring Groove Quantity: 2; Special Features: PISTON HAS 8 MOUNTING HOLES 1.25 IN DEPTH, .500-13UNC-2B WITH 45 DEG SEPARATION. IN. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.